Abstract: The role of void growth in triggering local necking in biaxially stretched sheets is investigated. A recently proposed constitutive equation for porous plastic materials is employed in conjunction ...

Abstract: The onset of flange wrinkling in the Swift cup test is analyzed as a plastic bifurcation problem. The flange is modelled as an annular plate made of an orthotropic elastic-plastic material ...

Abstract: In this paper is presented a general methodology for predicting puckering instabilities in sheet metal forming applications. A novel approach is introduced which does not use shell theory ...

Abstract: In this work we use a consistent homogenization theory approach to study the overall behavior of a highly porous elastic material at finite levels of strain. Although the matrix material in ...

Abstract: The instabilities of a finitely deformed Blatz-Ko material reinforced with fibers in a single direction (an anisotropic, nonlinearly elastic material) are examined. The loading is one of plane ...

Abstract: Traditional averaging and homogenization techniques, developed to predict the macroscopic properties of heterogeneous media, typically ignore microstructure related scale effects—that is, the influence ...

Abstract: Using the nonlinearly elastic planar lattice model presented in Part I, the influence of scale (i.e., the size of the representative volume, relative to the size of the unit cell) on the ...

Abstract: To investigate the relation between the macroscopic and microscopic instability predictions for certain microstructured media, we study the stability of an axially stretched fiber-reinforced composite ...

Abstract: The development of a one-dimensional finite strain elasto-plastic shell model appropriate for use in modelling straight drawbeads is outlined. Numerical results obtained using a finite element ...